Case Presentation: A 70 year-old woman with no known history was admitted with symptoms of urinary incontinence and generalized weakness. Workup was notable for a positive urinalysis, positive Influenza swab, and serum sodium of 142mmol/L. She was started on ceftriaxone, oseltamivir and isotonic fluids (normal saline). On hospital day (HD) 2, her sodium was 159mmol/L, [...]